一种高速恒流输出驱动电路的设计  

Design of a High Speed Constant Current Output Driver Circuit

作　　者：董铸祥[1] 李念龙[1] 于奇[1] 宁宁[1] 曹英帅[1] 

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,成都610054

出　　处：《微电子学》2013年第3期375-378,共4页Microelectronics

基　　金：中央高校基本科研业务费专项资金资助项目(ZYGX2010J040)

摘　　要：提出了一种新型的恒流输出驱动电路,该电路保持了传统电路的低负载电压调整率,同时,采用瞬间增强运放驱动的方式,提升了电路的开启速度。基于0.25μm BCD工艺,完成HSPICE仿真。结果表明,电路的负载电压调整率近似为0;输出电流为30mA时,电路的开启时间仅为10.3ns;在不同输出电流下,电路开启时间的差异较小。该电路可应用于开关电源、手机充电器及LED显示屏等电路芯片中。A new type of constant-current output driver circuit was proposed,which enhanced turn-on speed of the circuit by boosting op-amp driver instantly,while maintaining low load voltage regulation of the traditional circuit.The circuit was simulated with HSPICE based on 0.25 μm BCD process.Results showed that the circuit had an approximate zero load voltage regulation,and a turn-on time of only 10.3 ns for an output current of 30 mA,which had little difference for different output currents.The circuit is applicable for switching power supply,handset charger and LED display driver IC＇s.

关 键 词：电源管理 驱动增强 恒流输出 驱动电路 

分 类 号：TN433[电子电信—微电子学与固体电子学]